Plans for new unit tests

[simsong]

Currently SleuthKit is using travis and appveyor for CI/CD. The CI/CD system builds and performs minimal tests on a Windows system. The reason for this is that the majority of SleuthKit users are using it on Windows-based computers under Autopsy.

The current CI/CD system dates from a time before GitHub Actions were available.

This discussion is for migration to CI/CD running on Actions. The plan is to leave the travis and appveyor running until all functionality is moved to GitHub actions. However, this will not be a lift-and-shift. The plan is to start by building out unit tests incrementally. Only when we have new tests running in GitHub actions that do everything the travis and appveyor tests do will we turn them off.

Thoughts?

[joachimmetz]

Note that currently the tests on AppVeyor are failing https://ci.appveyor.com/project/bcarrier/sleuthkit/builds/49676147